42C heat causes havoc in Melbourne

Canada's Frank Dancevic required medical attention after fainting during his match against Benoit Paire, while a ball boy collapsed and needed medical support during Milos Raonic's four-set victory over Daniel Gimeno-Traver.

Former women's world number one Caroline Wozniacki later told reporters the heat melted a plastic water bottle during her straight sets win over Lourdes Dominguez Lino.